Is this not rather like a certain song which states "I heard there was a sacred chord that David played and it pleased the Lord"? It furthers a legend, but does not yet provide evidence that King David invented such a chord, or tell us what that chord was.
I am sure I have seen this in the Analecta Hymnica...Vol 49 pg 26, although we have 3 to choose from, and for the Octave day we have another but do you have the music?
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